Crystal IS Inc of Green Island, NY, USA — a subsidiary of Tokyo-based Asahi Kasei that makes proprietary ultraviolet light-emitting diodes (UVC LEDs) — has produced what it claims is the first reported 4-inch (100mm)-diameter single-crystal aluminium nitride (AlN) substrate, demonstrating the scalability of its processes for growing AlN bulk single crystals to meet production demands...
Source: https://www.semiconductor-today.com/new ... 0823.shtml